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Although people of all categories can be found in all careers, there are strong statistical correlations with certain lines of work. Scientists/inventors are often INTJ or INTP types (introverted, intuitive, thinking, and either perceiving or judging). People in the helping professions are often ISFJs. Sales people are often ESFJ, and so on.
Here's a simple version of the Myers-Briggs [humanmetrics.com] (the real thing is many pages long and is licenced only to professional psychologists). What types to we have here at WebmasterWorld? I would guess something of a bimodal distribution with the more computer-geekish people in the INT- area and the e-commerce/sales people in the ESF- area. But that's a guess.
RJO (INTJ)
Try reading the descriptions for other personality types and see how well you think they describe you... think if it's the one you'd read first you might have described it as accurate?